Does this error also occur on an new/clean project just with the plugin enabled and a chart widget created at level start (so it gets cooked)?
Because I have difficulties reproducing this error on my end.
Tried it now on some pure bp projects and c++ projects. Fresh/clean ones and also the provided chart example project, but never got any errors.
Neither in development configuration nor shipping.
Because that’s a linker error:
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If you have a c++ project, you need to add dependecies inside your projects build.cs file. (only if referenced inside code though)
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Or you may forgot to include a necessary header somewhere in your code
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Or you could also try reinstalling the plugin, maybe something got corrupted whilst the 5.0.1 update (maybe in the cleanup phase, as 5.0 had an bug too, where installing a code plugin getting the whole engine corrupted, which got fixed with 5.0.1)